all I know, coincidently
, is that if you use Winzip and open a zip file and there is a .cab in there and for some odd reason, you decide to double-click that .cab file, it'll open the cab...literally. You'll see it's contents (.cabs after all are compressed installation programs).
Guess how many files are in the Palm Messaging B4 .cab?
85
So she was attempting to unpack the .cab directly.